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Applications and systems can represent knowledge in a variety of ways. A graphic display might allow a knowledge analyst to infer new information through interactive visualizations. Knowledge can be represented as a collection of facts, which can then be used for automatic inference. Knowledge can also be represented or stored in various archives, such as databases or formatted files. Those developers challenged with creating applications for knowledge representation frequently have to contend not only with data challenges, but also with challenges caused by a wide variety of software toolkits, architectures, and standards for knowledge representation. To meet these obstacles, we developed the Prajna Project. The Prajna Project is a Java toolkit designed to provide various capabilities for visualization, knowledge representation, geographic displays, semantic reasoning, and data fusion. Within this paper, we present both the capabilities of the Prajna project, and use it to illustrate techniques that address these challenges.